NCTAM papers, National Congress of Theoretical and Applied Mechanics, Japan
The 60th Japan National Congress for Theoretical and Applied Mechanics
Session ID : OS17-09
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OS17
The interaction between zonal jets on a beta plane
*Kiori ObuseShin-ichi TakehiroMichio Yamada
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Abstract
It has been well known that, in the forced 2D barotropic incompressible flows on a rotating sphere, a structure with many alternating eastward and westward jets emerges in the course of time development. The multiple zonal jets experience gradual mergers/disappearances, and then a structure with two or three alternating large zonal jets is realised asymptotically. Zonal jets having a transverse sinusoidal background flow on a beta plane is one of the models used to investigate the effect of the turbulence and the mechanism of mergers/disappearances of the jets described above. This model was originally introduced and numerically investigated by Manfroi and Young (1999), and is known to show a structure with many zonal jets that slowly disappear one by one. In our study, we use analytical stationary solutions of the governing equation of the zonal jets and estimate the weak interaction between two zonal jets by a perturbation method to discuss the jets' gradual mergers/disappearances.
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© 2011 The Japan Society of Mechanical Engineers
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